5 Answers
5

GrammarGirl did a whole post on this. She explains that there is a difference between between and among. She writes:

Here's the deal: you can use the word “between” when you are talking about distinct, individual items even if there are more than two of them. For example, you could say, "She chose between Harvard, Brown, and Yale" because the colleges are individual items.

She goes on to explain that in the following cases, you use the two slightly differently:

Relationships: The Chicago Manual of Style describes these as one-to-one relationships. Sometimes they are between two items, groups, or people, as in these sentences:

Choose between Squiggly and Aardvark.

Let's keep this between you and me.

Other times they can be between more than two items, groups, or people as in these sentences:

The negotiations between the cheerleaders, the dance squad, and the flag team were going well despite the confetti incident.

The differences between English, Chinese, and Arabic are significant.

On the other hand, you use “among” when you are talking about things that aren't distinct items or individuals; for example, if you were talking about colleges collectively you could say, "She chose among the Ivy League schools."
If you are talking about a group of people, you also use “among”:

Fear spread among the hostages.

The scandal caused a division among the fans.

Squiggly and Aardvark are among the residents featured in the newsletter.

Part of a Group:
“Among” can also indicate that someone is part of a group or left out of a group, as in these examples:

He was glad to find a friend among enemies.

She felt like a stranger among friends.

Sylvia was later found living among the natives.

From this, you were correct in your use of between. "Cook et. al." formed part of a distinct group of individuals, so you would use between.

USAGEBetween is used in speaking of only two things, people, etc.: "we must choose between two equally unattractive alternatives."

Among is used for collective and undefined relations of usually three or more: "Agreement on landscaping was reached among all the neighbors."

--->But where there are more than two parties involved, between may be used to express one-to-one relationships of pairs within the group or the sense 'shared by': "There is close friendship between the members of the club."; diplomatic relations between the U.S., Canada, and Mexico.

Between you and I,: between you and he, etc., are incorrect; between should be followed only by the objective case: between you and me,: between you and him, etc.

Prescriptivist Poppycock

You should in this instance trust your own ear, not your friend’s opinion that there is a rule that says you are wrong. There isn’t, and you aren’t. Between has never been restricted to two items alone. In the citations below, this non-rule your friend alludes to is variously called a persistent but unfounded notion, a superstition slow to die, and prescriptivist poppycock.

A Rule That Doesn’t Rule

I recommend William Safire’s “On Language” column entitled “Betwixt Among And Between”. Safire answers — and at length — a correspondent who encountered much the same quandary as you did. He rightly calls the bogus “rule” that your friend sought to impose on you “a rule that doesn’t really rule”; one that “hangs on with no real authority”. Safire then goes on to try to discover who was first responsible for this nonsense.

Where did the “rule” begin? Who laid this guilt on Ms. Thorp? “Between is properly used of two,” Samuel Johnson wrote in his dictionary of 1755, “and among of more.” He saw tween as meaning “twain, two,” and therefore decided that it would be “proper” to limit the division to two. He did notice, however, that not everybody was as fastidious as him (or, as he would say, as he): “But perhaps,” he added, “this accuracy is not always preserved.”

Whether it is the esteemed Dr Johnson or anyone else doing the judging, a word’s meaning or “correctness” can never be judged by studying what the original words that gave rise to the current word once meant. This is called the etymological fallacy. It is never sound reasoning: words mean only what they mean here and now, not what they might have meant somewhen else.

Later lexicographers took issue with Johnson’s statement. Fowler calls this notion that one must always use between for two and never more than that a superstition that dies hard. Not long after Johnson, Noah Webster wrote in his dictionary of 1828 that between is not restricted to two, and the current entry for between in Merriam-Webster further expands upon this rebuttal:

There is a persistent but unfounded notion that between can be used only of two items and that among must be used for more than two. Between has been used of more than two since Old English; it is especially appropriate to denote a one-to-one relationship, regardless of the number of items. It can be used when the number is unspecified 〈economic cooperation between nations〉, when more than two are enumerated 〈between you and me and the lamppost〉 〈partitioned between Austria, Prussia, and Russia — Nathaniel Benchley〉, and even when only one item is mentioned (but repetition is implied) 〈pausing between every sentence to rap the floor — George Eliot〉. Among is more appropriate where the emphasis is on distribution rather than individual relationships 〈discontent among the peasants〉. When among is automatically chosen for more than two, English idiom may be strained 〈a worthy book that nevertheless falls among many stools — John Simon〉 〈the author alternates among modern slang, clichés and quotes from literary giants — A. H. Johnston〉.

OED: “In all senses, between has been, from its earliest appearance, extended to more than two.”

Being an historical dictionary aware of English in all its incarnations, the OED has in every edition disagreed with the idea that between could not be used for more than two. One of its Middle English citations quite specifically writes Betweyn us thre — that is, between us three. And three is without question greater than two.

In the second edition of the OED, this statement is made:

V. 19. In all senses, between has been, from its earliest appearance, extended to more than two. In OE. and ME. it was so extended in sense 1, in which among is now considered better. It is still the only word available to express the relation of a thing to many surrounding things severally and individually, among expressing a relation to them collectively and vaguely: we should not say ‘the space lying among the three points,’ or ‘a treaty among three powers,’ or ‘the choice lies among the three candidates in the select list,’ or ‘to insert a needle among the closed petals of a flower.’

As any native speaker immediately realizes, those four examples which the OED says that we “should not say” are failures as phrases go.

In the various citations the OED provides to document historical uses of between applied to more than two items (the earliest is from 971), these two stand out most ironically, since they are (allegedly) by the same author contradicting himself:

1755 Johnson Dict., ― Between is properly used of two, and among of more; but perhaps this accuracy is not always preserved.

So if Boswell is correctly quoting Johnson, then Johnson seems to have failed to take his own advice regarding propriety and accuracy. Apparently the good doctor’s native ear got the better of him — and a good thing, too, for it would have sounded silly for him to use among there.

“When zombie rules attack!”

In his Language Log article “Learning to speak Imaginary American”, linguist Mark Liberman identifies Goold Brown’s 1851 Grammar of English Grammars as the progenitor of what Liberman has filed under “prescriptivist poppycock”:

The idea that between must be used for two alternatives, and among for more than two, is a Zombie Rule with a pedigree. It was apparently invented by Goold Brown in 1851, in his Grammar of English Grammars, in order to demonstrate his superiority to earlier grammarians who had “misused” between for more than two alternatives.

If this is the origin point of uncounted mindless repetitions of a bogus rule foisted upon billions of English speakers and learners, it is is illustrative to examine exactly what Brown said and how he said it.

or, if you would,

The
Grammar
Of
English Grammars,
With
An Introduction
Historical and Critical ;
The Whole
Methodically Arranged and Amply Illustrated ;
With
Forms of Correcting and of Pausing, Improprieties For Correction,
Examples for Parsing, Questions for Examination, Exercises For Writing,
Observations For the Advanced Student,
Decisions and Proofs for the Settlement of Disputed Points,
Occasional Strictures and Defences,
An Exhibition of the Several Methods of Analysis,
And
A Key to the Oral Exercises :
To Which Are Added
Four Appendixes,
Pertaining Separately to the Four Parts of Grammar.
By Goold Brown,
Formerly Principal of an English and Classical Academy, New York ;
Author of the Institutes English Grammar,
The First Lines of English Grammar, etc.
“So let great authors have their due,
that Time, who is the author of authors,
be not deprived of his due,
which is, farther and farther,
to discover truth.” ―Lord Bacon
New York :
Published By Samuel S. & William Wood,
№ 261 Pearl Street,
1851.

(Interesting quote from Lord Bacon, eh? Apparently the truth is something to be “farther” discovered. Hm...)

Could the author of so humbly titled a work truly have attempted to show his “superiority” over previous grammarians, as Liberman writes?

Perhaps not, but let us examine the evidence and decide for ourselves.

Brown answers his own question of

What notice is taken of the application of between, betwixt, among, amongst, amid, amidst?

by observing on page 653 that

Obs. 13. ―Between, or betwixt, is used in in reference to two things or parties ;
among, or amonst, amid, or amidst, in reference to a greater number,
or to something by which an other may be surrounded : as,
“Thou pendulum betwixt a smile and tear.” ―Byron
“The host between the mountain and the shore.” ―Id.
“To meditate amongst decay, and stand a ruin amidst ruins.” ―Id.
In the following examples, the import of these prepositions is not very accurately regarded ;
“Ihe Greeks wrote in capitals, and left no spaces between their words.” ―Wilson’s Essay, p. 6.
This construction may perhaps be allowed, because the spaces by which words are now divided,
occur severally between one word and an other ; but the author might as well have said,
“and left no spaces to distinguish their words.”
“There was a hunting match agreed upon betwixt a lion, an ass, and a fox.” ―L’Estrange.
Here by or among would, I think, be better than betwixt, because the partners were more than two.
“Between two or more authors, different readers will differ
exceedingly, as to the preference in point of merit.” ―Campbell’s Rhet. p. 162; Jamieson's, 40 ;
Murray’s Gram., i, 360.
Say, “Concerning two or more authors,” because between is not consistent with the word more.
“Rising one among another in the greatest confusion and disorder.” ―Spect. No. 476.
Say, “Rising promiscuously,” or, “Rising all at once ; ” for among is not consistent with the distributive term one an other.

Even Brown himself can bring himself only to say that he “thinks” such-and-such would be better. There is no such rule. This is just a peever spouting off his pet peeve in a published format.

The problem is that people mistook a pet peeve for an actual rule of English grammar, like plural subjects taking plural verbs. It might be a usage recommendation (whether sound or otherwise), but a rule of grammar it is not.

But it gets worse. Brown digs his hole still deeper.

On page 657 Brown lays out more than a dozen “mistakes” committed by earlier scholars, and then proceeds on page 948 to “correct” these defects. Collating the originals from page 657 with Brown’s corrigenda from page 948 immediately following each, these are as follows (with all italics exactly as show in Brown, not editorial ones adds by this author):

"The superlative degree implies a comparison, sometimes between two, but generally among three or more.” ―Smith cor.

“They are used to mark a distinction between several objects.” ―Levizac’s Gram. p. 85.

“They are used to mark a distinction among several objects.” ―Levizac cor.

There you go. That’s what Brown thought people should be writing. Not only are almost all of Brown’s rewrites less felicitous than the original versions, many are cumbersome, artificial, and tedious. Some are laughably bad. In places his changes even alter the sentence’s very meaning, making it say something other than the original intended.

Liberman was right, for you can see Brown’s condescension bleeding through as he “corrects” the authors of earlier grammars, who apparently just weren’t as smart as Brown (thought that he himself) was.

Summary

There is no such “rule”, and there never was.

This is another artificial anti-English “rule” invented by the same set of scolding prescriptivists who took it upon themselves to forbid us from “splitting infinitives” and dangling prepositions off our sentences’ ends. It has no basis in actual English.

Sure, there are indeed places where between won’t comfortably fit, just as there are places where among will not. There are also places where either fits.

But this comfort-zone, or lack thereof, is determined by more than any simplistic yes–no question of whether exactly two parties are involved can ever hope to answer.

Wow! Just between me and you I think your answer is a little long, but it is without doubt, the most thorough and well-argued case against the rule: "...that between must be used for two alternatives, and among for more than two" I have ever read!
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Mari-Lou AAug 29 '14 at 4:50

2

@Mari-LouA I wrote it because I thought that the canonical among-vs-between question that we closed dupes to deserved a more substantive and citable answer than only one that drew on “Grammar Girl” as its primary authority.
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tchristAug 29 '14 at 10:19

It is not strictly correct that between is used for two things and among for more than two.

When exactly two entities are specified, between should always be used:
“This contract is entered into between the Seller and the Purchaser.”

However, when more than two entities are involved or when the number of entities is unspecified, the word choice depends on what you want to say. Between should be used where the relationship is distinctly one-to-one:

“The agreement was entered into between the Seller, the Purchaser and the Guarantor.”

Among should be used where the entities are considered as a group, mass or collectivity:

“There is consensus among shareholders that this approach be adopted.”

In your sentence, I would definitely have used between, as the relationship is clearly one-to-one. It would make more sense too.

When more than two things or persons are involved, among is usually
called for: "The money was divided among the four players." When,
however, more than two are involved but each is considered
individually, between is preferred: "an agreement between the six
heirs."